perf script: Autopep8 futex-contention

from __future__ import print_function

import os, sys

sys.path.append(os.environ['PERF_EXEC_PATH'] + '/scripts/python/Perf-Trace-Util/lib/Perf/Trace')

import os

import sys

sys.path.append(os.environ['PERF_EXEC_PATH'] +

                '/scripts/python/Perf-Trace-Util/lib/Perf/Trace')

from Util import *

process_names = {}

lock_waits = {}  # long-lived stats on (tid,lock) blockage elapsed time

process_names = {}  # long-lived pid-to-execname mapping

def syscalls__sys_enter_futex(event, ctxt, cpu, s, ns, tid, comm, callchain,

                              nr, uaddr, op, val, utime, uaddr2, val3):

    cmd = op & FUTEX_CMD_MASK

    thread_thislock[tid] = uaddr

    thread_blocktime[tid] = nsecs(s, ns)

def syscalls__sys_exit_futex(event, ctxt, cpu, s, ns, tid, comm, callchain,

                             nr, ret):

    if tid in thread_blocktime:

        del thread_blocktime[tid]

        del thread_thislock[tid]

def trace_begin():

    print("Press control+C to stop and show the summary")

def trace_end():

    for (tid, lock) in lock_waits:

        min, max, avg, count = lock_waits[tid, lock]

        print("%s[%d] lock %x contended %d times, %d avg ns" %

              (process_names[tid], tid, lock, count, avg))